| 新疆西部一次大暴雨过程水汽输送轨迹模拟 |
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| 引用本文： | 曾勇,杨莲梅,张迎新.新疆西部一次大暴雨过程水汽输送轨迹模拟[J].新疆气象,2017,11(3):47-54. |
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| 作者姓名： | 曾勇 杨莲梅 张迎新 |
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| 作者单位： | 中国气象局乌鲁木齐沙漠气象研究所,, |
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| 基金项目： | 科技部公益性行业科研专项(GYHY201506009),国家自然科学基金(41565003),国家自然科学基金国际合作项目(41661144024)共同资助 |
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| 摘 要： | 在分析2016年7月28日—8月2日新疆西部罕见大暴雨过程环流形势和影响系统的基础上,利用基于拉格朗日方法的轨迹模式HYSPLIT,应用GDAS资料,模拟计算了大暴雨期间不同区域不同高度的水汽输送轨迹、主要通道及不同源地的水汽贡献。结果表明:(1)200 h Pa高空偏西急流、700 h Pa和850 h Pa低空偏东急流及辐合线和500 h Pa稳定"两脊一槽"环流是大暴雨产生的天气背景;(2)大暴雨过程中阿克苏地区北部、伊犁河谷地区和博州地区东部1500、3000和5000 m水汽输送轨迹、主要通道及不同源地的水汽贡献存在差异,其中,阿克苏地区北部1500、3000、5000 m水汽分别主要来自中亚地区、中亚地区、地中海北部,水汽贡献分别占该高度水汽的38%、46%、48%;伊犁河谷地区1500、3000、5000 m水汽分别主要来自哈萨克斯坦、哈萨克斯坦、黑海南部,水汽贡献分别占该高度水汽的100%、50%、68%;博州地区东部1500、3000、5000 m水汽分别主要来自西西伯利亚、中亚地区、东欧,水汽贡献分别占该高度水汽的58%、54%、82%。水汽在输送过程中高度多变,以偏东和偏南路径为主输送到大暴雨区上空;(3)欧洲大陆、西西伯利亚、中亚地区等陆地及黑海、里海等海洋是此次大暴雨水汽主要来源。南疆低层偏东风和辐合线在水汽的聚集及向上输送中发挥了重要作用,高空急流产生的次级环流的下沉气流在将高空水汽向下输送中扮演了重要角色。
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| 关 键 词： | 新疆西部 大暴雨 水汽输送 拉格朗日轨迹 |
| 收稿时间： | 2017/3/8 0:00:00 |
| 修稿时间： | 2017/4/3 0:00:00 |
Simulation of Water Vapor Transport Trajectories of a Heavy Rain in West of Xinjiang |
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| Institution: | Institute of Desert and Meteorology,China Meteorological Administration,, |
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| Abstract: | Based on the analysis of the circulation situation and influence system of the rare heavy rain in west of Xinjiang from July 28 to August 2, 2016, the HYSPLIT model which based on the Lagrangian method was used to calculate the water vapor transport trajectories, the main passages and different contribution of water vapor sources of the different areas and different heights. The results showed that (1) 200 hPa high-altitude partial west jet, 700 hPa and 850 hPa low-altitude partial east jet and convergence line and 500 hPa stable "two ridges and one groove were the weather background of the heavy rain. (2) In the process of heavy rain, there were differences in the water vapor transport trajectory and the contribution of water vapor which came from different sources in the north of the Aksu area, the Yili River valley area and the east of the Bozhou area. The heights of water vapor passages is variable in the transportation process. And partial east and partial south passages were main path. (3) Continental Europe, Western Siberia, Central Asia and other lands and the Black Sea, the Caspian Sea and other seas were the main sources of the water vapor. The low-altitude partial east wind and the convergence line played an important role in the accumulation and upward transport of water vapor in south of Xinjiang, and the sinking airflow of the secondary circulation which produced by the high-level jet played an important role in conveying the high-altitude water vapor downwards. Almost all trajectories have been through the Central Asian region to reach the heavy rain areas, so we can see the Central Asian region was the key areas of water vapor passages in the process of heavy rain. |
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| Keywords: | West of Xinjiang Heavy rain Water vapor transport Lagrange trajectory |
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